Blue printing apparatus



Aug. 4, 1931. A. B. DlCKE Y BLUE PRINTING APPARATUS 2 Sheets-Sheet l riled Nov. 26, 1928 Aug. 4,1931.

A. B. DICKEY BLUE PRINTING APPARATUS Filed Nov.

26, 1928 2 Sheets-Sheet 2 Patented Aug. 4, 1931 UNITED STATES PATENT OFFICE ALFRED B. DICKEY, OF FORT WORTH, TEXAS, ASSIGNOR, BY DIRECT & MESNE ASSIGN- MENTS, 'IO GULF PRODUCTIONGOMPANY, OF FORT WORTH, TEXAS, A CORPORA- TION OF TEXAS BL E PRINTING APPARATUS Application filed November 26, 1928. Serial No. 321,992.

This invention relates to improvements in blue printing apparatus wherein reaches or portions of sensitized paper are ied from supply of such paper and positioned .on

a tracing previously placed over an exposure opening that has associated therewith asuitable sourceof light for eifecting thezprint One object of the invention is to eliminate the necessity of providing a dark room in which to use the apparatus. Stated more specifically, the invention consistsin ho using the supply of sensitized paper in a light, proof casing mounted on the contact pad that is generally used for pressing the paper against the tracing from which the print to be made. By having the supply of sensitized paper carried on the contact pad, said pad may be swiveled on its support so 0 as to permit said pad to be rotated, whereby the paper may be positioned across the exposure opening at any desired angle.

In the preferred embodiment of the invention, the pad is also provided w th means for holding the paper under tension against the face of the pad and means are also provided on the pad for facilitating severing each portion of the paper as itis exposed. The exposure opening is formed in the top of a table or the like that is qu te large compared with the area of opening whereby large tracings, of which only a small portion is to be duplicated, may be easily handled in the machine. In view of this said table top or other support for the tracing'is also formed with depress ons at opposite sides of theexposure opening for receiving and holding the rolled end portions of a large tracing frointhe intermediate portion of which a print IS tO be made. With these and other objects in new, the present invention consists of certa n novel details of construction and combinations and arrangements of parts, all as Will hereinafter he more fully described and the novel features thereof particularly pointed out in the appended claims.

I In the accompanying drawings, illustrating the preferred embodiment of the invention,

I Figure 1 is a perspective View of the ap paratus from one end thereof;

Fig. 2 is a similar view from the opposite end, the lamp mechanism or source of light being omitted; and

Fig. 3 is a longitudinal sectional view of the contact pad.

In accordance with general oractice the apparatus comprises a table W ose top 10 has an exposure opening 11 therein, there 1 being a mask 12 around the edge of said opening. Suitably supported beneath the table is a source of light,'but as this may be of any desired type it is only shown more or less diagrammatically in the present inupright supporting member consisting of in two sections, one of which 19 is rotatably supported in the other section 20 which is slidably supported in guides 21 on suitable cross pieces of the table. At its lower end section 20 is connected to a foot lever 22 ful- 3:

crumed on a crossbar 23. As will be apparent, by depressing lever 22 the contact pad may be raised from the exposure opening and if it is desired to retain it in this position without maintaining pressure on said lever, arm 18 and section 19 may be rotated until the lug 24 on said section is positioned over an abutment 25 on the table. This abutment consists of a block formed with a slot 26 into which lug 24 moves when the pad is lowered to the position it occupies when printing. The swivel connection between the pad and arm 18 may consist of a flange 27 on the post 28 which carries the a 18. Preferably, arm 18 has anordinary T- joint at its end loosely receiving the post 28 whose upper end projects above the joint and has a cap 31 secured thereon.

In order to eliminate the necessity of using the apparatus in a dark room, as well as to facilitate manipulation of the sensitized paper, the supply of such paper, preferably in the form of a. roll 32 rotatably supported in brackets 33 on the pad. is housedwithin a closed casing 3st onsaid pad. The. paper is fed through a slot 35 in the pad at. one end thereof beneath casing 3 and in said slot, as well as at the oppositeend; of the pad, there are spring metal clips 36, 37, by means of which a portion or reach of the paper may be held under tension alongthe bottom face of the pad. The clip 37 in clamping the paper, cooperates with a knife 38 secured to the pad so that. each increment or portion of paper is exposed and pulled through between said clip and knife, it can be easily severed. Clip 37 is mounted on a guard 39 on the pad.

lVith this arrangement, there is practically no wear on a tracing regardless of the number of prints made therefrom because each time an exposure is ]I1t1ClQ.tl1O pad can be slightly ele 'atedby pressure on the foot lever, so that there is no rubbing against the tracing while the next succeeding portion of paper is being positioned on the bottom of the pad. For the same reason, the position of the tracing with respect to the exposure opening remainsunaffected by the movement ofthe paper alongthe face of the pad. It will be understood, of course, that the casing is removable to allow replenishment of the paper.

As before mentioned, it is oftentimes desired to reproduce only small sections of an intermediate portion of alarge tracing. To facilitate handling of such large tracings, depressions it) are formed in the table top at opposite sides of the exposure opening and when an intermediate portion of:a large tracing is placed over the opening the rolled end portions thereof are placed in said dcpres ions and thereby held agaii t unrolling. Large tracings can, therefore, be

handled with a great deal more case than if the table top is perfectly plane.

Wl it is claimed is:

1. In a blue printing apparatus, the com- A bination of a table having an exposure opening, a source of light below said table, a contact pad carried above anddisconuected from the table, a closed casing on said pad for asupply of sensitized paper, said paper being adapted to be fed along the bottom surface of said pad, and clips carried by said pad at each end for holding the reach of paper under tension along saidbottom surface.

52. In a blue printing apparatus, the com-. bination of a table having an exposure opening, a source of light below said table, a contact pad carried above the table and disconnected therefrom, a closed casing on said pad for a supply of sensitized paper saidclip at the forward end of the pad for 7 facilitating severance of portions of the paper fed from said casing.

3, In ablue printing apparatus, the combination of a table having an exposure opening,.' a source of light below the table, a contact pad located above the table, a support for said pad and a casing on said pad for housing a supply of sensitized paper adapted to be fed along the bottom surface of the pad, said pad being swiveledon its support whereby a reach of paper along the bottom surface of said pad can be positioned across said exposure opening at any desired angle.

l. In a blue printing apparatus, the combination of a table having an exposure opening therein, a source of light below said opening, a contact pad above the table, a vertically movable support for said pad,

said support being rotatable to adjust the pad horizontally of the table and said pad being rotatably secured to its support, and means for positioning a reach of sensitized paper on the bottom face of said pad.

5. In a blue printing apparatus, the combination of a table having an exposure opening therein, a source of lightbelow said opening, a contact pad above the table, a vertically movable support for said pad, said support being rotatable to adjust the pad horizontally of: the table and said pad being rotatably secured to its support, a closed housing on said pad for a supply of sensitized paper adapted to be fed along the bottonrsurface of said pad, and means for positioning said paper on said bottom surface under tension.

6. In a blue printing apparatus, the combination of a table having an exposure opening therein and depressions therein at opposite sides of said opening adapted to receive unrolled portions of a tracing laid across said opening, a source of light associated with said opening, and a contact pad adapted to position a strip of sensitized paper against the portion of the tracing across said opening.

7. In a blue printing apparatus, the combination of a table having an exposure openingin one surface thereof, a source of 0 light below the table, a contact pad carried above the table and adjustable in a plane parallel to said table surface and a closed casing. on saidpad for a supply of sensitized paper.

8. In a blue printing apparatus the combination of a table havin an exposure opening therein, a source 0% light beneath said table, a vertically movable contact pad carried above the table, said pad bein adjustable in a horizontal plane, and a. c osed casing on said pad for a supply of sensitized paper.

A. B. DICKEY. 

